No, he's not akin to Rosa Parks. Not at all.
Call me picky, but tragic as being told to take off a t-shirt may be, it's not quite as bad as the systematic segregation of public transportation based on skin color.
And while fighting for your right to wear a t-shirt is a very fine, very American idea, it is not quite as brave as being a middle-aged black woman in Alabama in 1955 telling a white man she's not giving him her seat despite the fact that the law requires her to do so. And oh, by the way, in the process, she gets arrested. And then sparks the Montgomery Bus Boycott, which is the seed of the Civil Rights Movement as we know it. The Bus Boycotters not only introduced a 26-year-old pastor by the name of Martin Luther King junior into national public life, but after many months of car pools, walking, and court fights against bus segregation, got the separate-but-equal doctrine declared illegal once and for all.
http://www.thisamericanlife.org/radio-archives/episode/226/transcript